Portion of a vehicle grille



FIG. 1 is a perspective view of a portion of a vehicle grille showing the new design;

FIG. 2 is front elevational view thereof; and,

FIG. 3 is a right side elevational view thereof, a left side elevational view thereof being a mirror image of the right side elevational view.

The top view, bottom view and rear view of the portion of a vehicle grille not shown are disclaimed. The broken line portion showing the remainder of the vehicle grill is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a vehicle grille, as shown and described. 